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Re: a explain plan question

From: Remigiusz Soko?owski <rems_at_wp-sa.pl>
Date: Tue, 30 Jan 2007 16:13:46 +0100
Message-id: <45BF60AA.6060203@wp-sa.pl>

>
> Execution Plan
> ----------------------------------------------------------
> 0 SELECT STATEMENT Optimizer=CHOOSE (Cost=1022392 Card=934
> Bytes=49502)
> 1 0 SORT (GROUP BY) (Cost=1022392 Card=934 Bytes=49502)
> 2 1 NESTED LOOPS (Cost=814767 Card=182275095 Bytes=9660580035)
> 3 2 TABLE ACCESS (FULL) OF 'TUD_FEDIA' (Cost=3 Card=30
> Bytes=480)
> 4 2 PARTITION RANGE (ITERATOR)
> 5 4 TABLE ACCESS (FULL) OF 'TUH_NVPAGINA' (Cost=27159
> Card=5992606 Bytes=221726422)
>
> I was wondering how to read this plan, the order of steps. From old
> set autotrace trace exp it seems to me that step 5 is the first step?
>
> 5 4 TABLE ACCESS (FULL) OF 'TUH_NVPAGINA' (Cost=27159
> Card=5992606 Bytes=221726422)
>

AFAIK the first most nested line is the first line (in this example the one indicated by You)

Regards
Remigiusz

-- 
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Remigiusz Sokolowski <rems_at_wp-sa.pl>
WP/PTI/DIP/ZAB (+04858) 52 15 770
MySQL  v.  4.x
Oracle v. 10.x
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Received on Tue Jan 30 2007 - 09:13:46 CST

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